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Chapter 4 Authentication Applications Henric Johnson Blekinge Institute of Technology,Sweden http://www.its.bth.se/staff/hjo/ [email_address]
Outline ,[object Object],[object Object],[object Object],[object Object]
Security Concerns ,[object Object],[object Object],[object Object],[object Object],[object Object]
KERBEROS ,[object Object]
KERBEROS ,[object Object],[object Object],[object Object],[object Object],[object Object]
KERBEROS ,[object Object],[object Object],[object Object],[object Object]
Kerberos Version 4 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A Simple Authentication Dialogue ,[object Object],[object Object],[object Object],[object Object]
Version 4 Authentication Dialogue ,[object Object],[object Object],[object Object],[object Object],[object Object]
Version 4 Authentication Dialogue ,[object Object],[object Object],[object Object],Ticket-Granting Service Echange: To obtain Service-Granting Ticket (3)  C    TGS:  IDv ||Ticket tgs  ||Authenticatorc (4)  TGS    C:  E Kc  [K c,¨v || IDv || TS 4  || Ticket v ] Client/Server Authentication Exhange: To Obtain Service (5) C    V:  Ticket v  || Authenticator c (6)  V    C:   EKc,v[TS5 +1]
Overview of Kerberos
Request for Service in Another Realm
Difference Between Version 4 and 5 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Kerberos Encryption Techniques
PCBC Mode
Kerberos - in practise     ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
X.509 Authentication Service ,[object Object],[object Object],[object Object],[object Object]
X.509 Formats
Typical  Digital Signature Approach
Obtaining a User’s Certificate ,[object Object],[object Object],[object Object]
X.509 CA Hierarchy
Revocation of Certificates ,[object Object],[object Object],[object Object],[object Object]
Authentication Procedures
Recommended Reading and WEB Sites ,[object Object],[object Object],[object Object],[object Object]

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Authentication Application in Network Security NS4